Objectives Compare chemical reactions to physical changes Compare parts of an atom Calculate the mass of one mole of an element or compound Explain how ionic and covalent bonds are formed Identify the parts of chemical equations ID: 928525
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Slide1
Group BlueBlock 1
Chapter 8: Chemical Reactions and Physical Changes
Slide2Objectives
Compare chemical reactions to physical changesCompare parts of an atomCalculate the mass of one mole of an element or compound
Explain how ionic and covalent bonds are formedIdentify the parts of chemical equationsDistinguish between reversible and irreversible reactions and changes
Slide3Vocab
Chemical reaction
: the change of substances into other substancesExample: A candle’s wick catching fireVideo: http://www.youtube.com/watch?v=C5tOEBmBAHgPhysical change: an alteration of a substance that does not change its chemical compositionExample: Melting wax on a candleAtomic number: the number of protons in an atomNeutron: an uncharged atomic particleNucleus: the dense core of an atomVideo: http://www.youtube.com/watch?v=FooZ9AwPSG8Protons: particle with a positive electrical charge
Slide4Cont.
Electron: negatively charged particle that moves around the nucleusMass number: total protons and neutrons in an atom’s nucleus
Atomic mass: the average mass of a sample of atoms of that element found in naturePeriodic table: chart that arranges elements by atomic number into rows and columns according to similarities in their properties
Slide5MASS NUMBER
Slide6Cont.
Mole
: the unit of measure used to count molecules or atomsEquation: 6.02 * 10^23Chemical bonds: the forces that hold atoms togetherIons: charged particlesIonic bond: the bond formed by the transfer of electrons between atomsExample: one metal and one nonmetal bondingIonic compounds: compounds that result when metals and non-metals bond ionically with each otherCovalent bond: atoms share electrons with each otherExample: two nonmetals bonding
Slide7Cont.
Chemical equation: written description of a chemical reaction using symbols and formulasReactants: the elements or compounds present at the start of a reaction
Products: the elements or compounds formed during the reactionCovalent compounds: compounds formed by the sharing of electrons